AIM:To investigate screening makers for gastric cancer,we assessed the association between gastric cancer and serum pepsinogens(PGs).METHODS:The subjects comprised 450 patients with gastric cancer,111 individuals with...AIM:To investigate screening makers for gastric cancer,we assessed the association between gastric cancer and serum pepsinogens(PGs).METHODS:The subjects comprised 450 patients with gastric cancer,111 individuals with gastric atrophy,and 961 healthy controls.Serum anti-Helicobacter pylori(H.pylori) immunoglobulin G(IgG),PGⅠand PG Ⅱ were detected by enzyme-linked immunosorbent assay.Gastric atrophy and gastric cancer were diagnosed by endoscopy and histopathological examinations.Odds ratios and 95%CIs were calculated using multivariate logistic regression.RESULTS:Rates of H.pylori infection remained high in Northeastern China.Rates of H.pylori IgG positivity were greater in the gastric cancer and gastric atrophy groups compared to the control group(69.1% and 75.7% vs 49.7%,P < 0.001).Higher levels of PG Ⅱ(15.9 μg/L and 13.9 μg/L vs 11.5 μg/L,P < 0.001) and lower PGⅠ/PG Ⅱ ratio(5.4 and 4.6 vs 8.4,P < 0.001) were found in patients with gastric cancer or gastric atrophy compared to healthy controls,whereas no correlation was found between the plasma PGⅠconcentration and risk of gastric cancer(P = 0.537).In addition,multivariate logistic analysis indicated that H.pylori infection and atrophic gastritis were independent risk factors for gastric cancer.Lower plasma PGⅠ/PG Ⅱ ratio was associated with higher risks of atrophy and gastric cancer.Furthermore,plasma PG Ⅱ?level?significantly?correlated?with?H.pyloriinfected gastric cancer.CONCLUSION:Serum PG Ⅱ concentration and PG Ⅰ/PG Ⅱ ratio are potential biomarkers for H.pyloriinfected gastric disease.PG Ⅱ is independently associated with risk of gastric cancer.展开更多
We have investigated the pressure effect on the eletrorotation (ER) spectrum of living cell suspensions byconsidering the particle shape effect. In particular, we consider coated oblate spheroidal particles and presen...We have investigated the pressure effect on the eletrorotation (ER) spectrum of living cell suspensions byconsidering the particle shape effect. In particular, we consider coated oblate spheroidal particles and present a theoreticalstudy of ER based on the spectral representation theory. Analytic expressions for the characteristic frequency as wellas the dispersion strength can be obtained, thus simplifying the fitting of experimental data on oblate spheroidal cellsthat abound in the literature. From the theoretical analysis, we find that the cellshape, coating as well as materialparameters can change the ER spectrum. We demonstrate a good agreement between our theoretical predictions andexperimental data on human erthrocytes suspensions.展开更多
AIM:To assess the role of Helicobacter pylori(H.pylori),gastroesophageal reflux disease(GERD),age,smoking and body weight on the development of intestinal metaplasia of the gastric cardia(IMC).METHODS:Two hundred and ...AIM:To assess the role of Helicobacter pylori(H.pylori),gastroesophageal reflux disease(GERD),age,smoking and body weight on the development of intestinal metaplasia of the gastric cardia(IMC).METHODS:Two hundred and seventeen patients scheduled for esophagogastroduodenoscopy were enrolled in this study.Endoscopic biopsies from the esophagus,gastroesophageal junction and stomach were evaluated for inflammation,the presence of H.pylori and intestinal metaplasia.The correlation of these factors with the presence of IMC was assessed using logistic regression.RESULTS:IMC was observed in 42% of the patients.Patient age,smoking habit and body mass index(BMI) were found as potential contributors to IMC.The risk of developing IMC can be predicted in theory by combining these factors according to the following formula:Risk of IMC = a + s-2B where a = 2,…6 decade of age,s = 0 for non-smokers or ex-smokers,1 for < 10 cigarettes/d,2 for > 10 cigarettes/d and B = 0 for BMI < 25 kg/m2(BMI < 27 kg/m2 in females),1 for BMI > 25 kg/m2(BMI > 27 kg/m2 in females).Among potential factors associated with IMC,H.pylori had borderline signif icance(P = 0.07),while GERD showed no signif icance.CONCLUSION:Age,smoking and BMI are potential factors associated with IMC,while H.pylori and GERD show no significant association.IMC can be predicted in theory by logistic regression analysis.展开更多
Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS) has become a powerful tool for analyzing the detailed composition of petroleum samples. However, the correlation between the numerous peaks obtain...Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS) has become a powerful tool for analyzing the detailed composition of petroleum samples. However, the correlation between the numerous peaks obtained by FT-ICR MS and bulk properties of petroleum samples is still a challenge. In this study, the internal standard method was applied for the quantitative analysis of four straight-run vacuum gas oils(VGO) by atmospheric pressure photoionization(APPI) FT-ICR MS. The heteroatom class distribution of these VGO samples turned to be different when the concentration changed. Linear relationship between the normalized abundance and the concentration of VGO samples was identified for the total aromatic compounds, aromatic hydrocarbons, S1 and N1 species. The differences of the response factors were also discussed. The sulfur contents of a series of crude oils were proved to be linear with the FT-ICR MS data calibrated by the response factor of S1 species. This study demonstrated the feasibility of the internal standard method in quantitative analysis with APPI FT-ICR MS, and the bulk properties of petroleum samples could be correlated directly with the FT-ICR MS data.展开更多
AIM: To investigate age, sex, histopathology and Helicobacter pylori (H. pylori) status, as risk factors for gastroduodenal disease outcome in Brazilian dyspeptic patients.tients submitted to upper gastroscopy at Hosp...AIM: To investigate age, sex, histopathology and Helicobacter pylori (H. pylori) status, as risk factors for gastroduodenal disease outcome in Brazilian dyspeptic patients.tients submitted to upper gastroscopy at Hospital das Clinicas of Marilia, antral biopsy specimens were obtained and subjected to histopathology and H. pylori diagnosis. All patients presenting chronic gastritis (CG) and peptic ulcer (PU) disease localized in the stomach, gastric ulcer (GU) and/or duodenal ulcer (DU) were included in the study. Gastric biopsies (n = 668) positive for H. pylori by rapid urease test were investigated for vacuolating cytotoxin A (vacA ) medium (m) region mosaicism by polymerase chain reaction. Logistic regression analysis was performed to verify the association of age, sex, histopathologic alterations, H. pylori diagnosis and vacA m region mosaicism with the incidence of DU, GU and CG in patients. RESULTS: Of 1466 patients submitted to endoscopy, 1060 (72.3%) presented CG [male/female = 506/554; mean age (year) ± SD = 51.2 ± 17.81], 88 (6.0%) presented DU [male/female = 54/34; mean age (year) ± SD = 51.4 ± 17.14], and 75 (5.1%) presented GU [male/female = 54/21; mean age (year) ± SD = 51.3 ± 17.12] and were included in the comparative analysis. Sex and age showed no detectable effect on CG incidence (overall c 2 = 2.1, P = 0.3423). Sex [Odds ratios (OR) = 1.8631, P = 0.0058] but not age (OR = 0.9929, P = 0.2699) was associated with DU and both parameters had a highly significant effect on GU (overall c 2 = 30.5, P < 0.0001). The histopathological results showed a significant contribution of ageing for both atrophy (OR = 1.0297, P < 0.0001) and intestinal metaplasia (OR = 1.0520, P < 0.0001). Presence of H. pylori was significantly associated with decreasing age (OR = 0.9827, P < 0.0001) and with the incidence of DU (OR = 3.6077, P < 0.0001). The prevalence of m1 in DU was statistically significant (OR = 2.3563, P = 0.0018) but not in CG (OR = 2.678, P = 0.0863) and GU (OR = 1.520, P = 0.2863). CONCLUSION: In our population, male gender was a risk factor for PU; ageing for GU, atrophy and metapla-sia; and H. pylori of vacA m1 genotype for DU.展开更多
基金Supported by National Natural Science Foundation of China,No. 30972476 and 81072369
文摘AIM:To investigate screening makers for gastric cancer,we assessed the association between gastric cancer and serum pepsinogens(PGs).METHODS:The subjects comprised 450 patients with gastric cancer,111 individuals with gastric atrophy,and 961 healthy controls.Serum anti-Helicobacter pylori(H.pylori) immunoglobulin G(IgG),PGⅠand PG Ⅱ were detected by enzyme-linked immunosorbent assay.Gastric atrophy and gastric cancer were diagnosed by endoscopy and histopathological examinations.Odds ratios and 95%CIs were calculated using multivariate logistic regression.RESULTS:Rates of H.pylori infection remained high in Northeastern China.Rates of H.pylori IgG positivity were greater in the gastric cancer and gastric atrophy groups compared to the control group(69.1% and 75.7% vs 49.7%,P < 0.001).Higher levels of PG Ⅱ(15.9 μg/L and 13.9 μg/L vs 11.5 μg/L,P < 0.001) and lower PGⅠ/PG Ⅱ ratio(5.4 and 4.6 vs 8.4,P < 0.001) were found in patients with gastric cancer or gastric atrophy compared to healthy controls,whereas no correlation was found between the plasma PGⅠconcentration and risk of gastric cancer(P = 0.537).In addition,multivariate logistic analysis indicated that H.pylori infection and atrophic gastritis were independent risk factors for gastric cancer.Lower plasma PGⅠ/PG Ⅱ ratio was associated with higher risks of atrophy and gastric cancer.Furthermore,plasma PG Ⅱ?level?significantly?correlated?with?H.pyloriinfected gastric cancer.CONCLUSION:Serum PG Ⅱ concentration and PG Ⅰ/PG Ⅱ ratio are potential biomarkers for H.pyloriinfected gastric disease.PG Ⅱ is independently associated with risk of gastric cancer.
文摘We have investigated the pressure effect on the eletrorotation (ER) spectrum of living cell suspensions byconsidering the particle shape effect. In particular, we consider coated oblate spheroidal particles and present a theoreticalstudy of ER based on the spectral representation theory. Analytic expressions for the characteristic frequency as wellas the dispersion strength can be obtained, thus simplifying the fitting of experimental data on oblate spheroidal cellsthat abound in the literature. From the theoretical analysis, we find that the cellshape, coating as well as materialparameters can change the ER spectrum. We demonstrate a good agreement between our theoretical predictions andexperimental data on human erthrocytes suspensions.
文摘AIM:To assess the role of Helicobacter pylori(H.pylori),gastroesophageal reflux disease(GERD),age,smoking and body weight on the development of intestinal metaplasia of the gastric cardia(IMC).METHODS:Two hundred and seventeen patients scheduled for esophagogastroduodenoscopy were enrolled in this study.Endoscopic biopsies from the esophagus,gastroesophageal junction and stomach were evaluated for inflammation,the presence of H.pylori and intestinal metaplasia.The correlation of these factors with the presence of IMC was assessed using logistic regression.RESULTS:IMC was observed in 42% of the patients.Patient age,smoking habit and body mass index(BMI) were found as potential contributors to IMC.The risk of developing IMC can be predicted in theory by combining these factors according to the following formula:Risk of IMC = a + s-2B where a = 2,…6 decade of age,s = 0 for non-smokers or ex-smokers,1 for < 10 cigarettes/d,2 for > 10 cigarettes/d and B = 0 for BMI < 25 kg/m2(BMI < 27 kg/m2 in females),1 for BMI > 25 kg/m2(BMI > 27 kg/m2 in females).Among potential factors associated with IMC,H.pylori had borderline signif icance(P = 0.07),while GERD showed no signif icance.CONCLUSION:Age,smoking and BMI are potential factors associated with IMC,while H.pylori and GERD show no significant association.IMC can be predicted in theory by logistic regression analysis.
基金supported by the Major State Basic Research Development Program of China(973 Program,No.2012CB224801)
文摘Fourier transform ion cyclotron resonance mass spectrometry(FT-ICR MS) has become a powerful tool for analyzing the detailed composition of petroleum samples. However, the correlation between the numerous peaks obtained by FT-ICR MS and bulk properties of petroleum samples is still a challenge. In this study, the internal standard method was applied for the quantitative analysis of four straight-run vacuum gas oils(VGO) by atmospheric pressure photoionization(APPI) FT-ICR MS. The heteroatom class distribution of these VGO samples turned to be different when the concentration changed. Linear relationship between the normalized abundance and the concentration of VGO samples was identified for the total aromatic compounds, aromatic hydrocarbons, S1 and N1 species. The differences of the response factors were also discussed. The sulfur contents of a series of crude oils were proved to be linear with the FT-ICR MS data calibrated by the response factor of S1 species. This study demonstrated the feasibility of the internal standard method in quantitative analysis with APPI FT-ICR MS, and the bulk properties of petroleum samples could be correlated directly with the FT-ICR MS data.
基金Supported by Fundaao de Amparo a Pesquisa do Estado de So Paulo (FAPESP), Research Grant 06/01223-0Fellowship CGF 2001/14509-5
文摘AIM: To investigate age, sex, histopathology and Helicobacter pylori (H. pylori) status, as risk factors for gastroduodenal disease outcome in Brazilian dyspeptic patients.tients submitted to upper gastroscopy at Hospital das Clinicas of Marilia, antral biopsy specimens were obtained and subjected to histopathology and H. pylori diagnosis. All patients presenting chronic gastritis (CG) and peptic ulcer (PU) disease localized in the stomach, gastric ulcer (GU) and/or duodenal ulcer (DU) were included in the study. Gastric biopsies (n = 668) positive for H. pylori by rapid urease test were investigated for vacuolating cytotoxin A (vacA ) medium (m) region mosaicism by polymerase chain reaction. Logistic regression analysis was performed to verify the association of age, sex, histopathologic alterations, H. pylori diagnosis and vacA m region mosaicism with the incidence of DU, GU and CG in patients. RESULTS: Of 1466 patients submitted to endoscopy, 1060 (72.3%) presented CG [male/female = 506/554; mean age (year) ± SD = 51.2 ± 17.81], 88 (6.0%) presented DU [male/female = 54/34; mean age (year) ± SD = 51.4 ± 17.14], and 75 (5.1%) presented GU [male/female = 54/21; mean age (year) ± SD = 51.3 ± 17.12] and were included in the comparative analysis. Sex and age showed no detectable effect on CG incidence (overall c 2 = 2.1, P = 0.3423). Sex [Odds ratios (OR) = 1.8631, P = 0.0058] but not age (OR = 0.9929, P = 0.2699) was associated with DU and both parameters had a highly significant effect on GU (overall c 2 = 30.5, P < 0.0001). The histopathological results showed a significant contribution of ageing for both atrophy (OR = 1.0297, P < 0.0001) and intestinal metaplasia (OR = 1.0520, P < 0.0001). Presence of H. pylori was significantly associated with decreasing age (OR = 0.9827, P < 0.0001) and with the incidence of DU (OR = 3.6077, P < 0.0001). The prevalence of m1 in DU was statistically significant (OR = 2.3563, P = 0.0018) but not in CG (OR = 2.678, P = 0.0863) and GU (OR = 1.520, P = 0.2863). CONCLUSION: In our population, male gender was a risk factor for PU; ageing for GU, atrophy and metapla-sia; and H. pylori of vacA m1 genotype for DU.
